If you know how you can solve this issue directly this will be great, otherwise you may not stop the IE from loading and retry it later (load the addon in delay but don't stop the user from working with the IE :)).

I have just tried to reproduce the issue on my computer with Internet Explorer 9. Unfortunately I couldn't get any delay loading IE programmatically from a windows application. What code do you use for running Internet Explorer by software? Why did you set the LoadInMainProcess property to true?

BTW What IE version do you have installed on problematic PC? Could you please take a screenshot of the About dialog window?

We are using the LoadOnMainProcess = true to get the on tab activated event on IE 8.

The software opens the IE using shell execute, when i tried to reproduce it using winforms application everything is working, but using the customer ERP software (some legacy foxpro application) it stuck.

In a test we just did when we are using the loader from IE package of adx (adx for ie 7.2.4104) it stuck but when we replace it with the loader from the office package (adx for office 6.6.3059) everything is working. as far as i know both loaders are the same, right?

The machine is the same machine that we encounter the performance problems (the .net 2 certificate issue).

In any case its not a good idea to do a while that can take for ever in the loading process, it better to do it asynchronously (to let the use interact with the IE).

There is not any reliable way to inject the loader after IE starts. That is why I use 'while'.
Now I am trying to reproduce the issue on our PCs. In any case the 'LoadOnMainProcess' property will be marked as 'obsolete' in the new major version of Add-in Express. The new version will provide improved tab navigation based on some native IE interfaces.

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